@1.2e-3[key: value]
@1.2e-3 [key: value]
@1.2e-3[()]
@1.2e-3 [()]
@1.2e-3[matched_expression]
@1.2e-3 [matched_expression]
@1.2e-3[matched_expression,]
@1.2e-3 [matched_expression,]
